Create New Case capture output?

In this line in case_creator for running the create_newcase CIME command:
```
runout = subprocess.run(cmd, shell=True, capture_output=True)
```

If create_newcase has a prompt for output (in this specific case, replace, abort, etc..). the command hangs. Do we need to capture output? If we don't capture output, the user would see the prompt and maybe would be a bit clearer